It takes less than a minute after Tim Duncan pulls up to the entrance of his car customization business in San Antonio, BlackJack Speed Shop, to realize that this isn’t the same mild-mannered Tim Duncan in a Spurs uniform. Stepping out of his blue Porsche 911 Turbo with gold-finished Pur Wheels—one of his nine customized cars—Duncan…Read More Source: Tim Duncan Revs Up Style in His …